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Fluorine (F) – Element 9 of the periodic table

Fluorine (symbol F) is element number 9 of the periodic table and belongs to the “Halogen” category. Its atomic mass is about 18.998, and its phase under standard conditions is Gas. This element sits in period 2 and group 17 of the periodic table, and its electrons are arranged in shells of 2, 7. The short electron configuration of Fluorine is [He] 2s² 2p⁵. Known uses of Fluorine include Toothpaste, Refrigerants and Uranium production.

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Properties of Fluorine

Atomic number
9
Chemical symbol
F
Atomic mass
18.998
Category
Halogen
Period
2
Group
17
Phase
Gas
Protons
9
Electrons
9
Neutrons (approx.)
10
Electron shells
2, 7
Outer-shell electrons
7
Discovered
Henri Moissan (1886)

Electron configuration of Fluorine

The electron configuration of Fluorine (F), with 9 electrons, is shown below. The last shell (shell 2) is highlighted:

Full configuration
1s² 2s² 2p⁵
Short configuration
[He] 2s² 2p⁵
Last shell
2s² 2p⁵

What is electron configuration and how is it written?

Electron shells of Fluorine

Distribution of 9 electrons of Fluorine across shells K to L:

  1. K2
  2. L7

What is a halogen?

The halogens are the group 17 elements: highly reactive nonmetals that form salt compounds with metals.

Uses of Fluorine

Frequently asked questions about Fluorine

What is the atomic number of Fluorine?

The atomic number of Fluorine (F) is 9; that is, every atom of it has 9 protons.

What is the electron configuration of Fluorine?

The electron configuration of Fluorine (F) is 1s² 2s² 2p⁵; in short form it is [He] 2s² 2p⁵, and its last shell is 2s² 2p⁵.

What is the chemical symbol of Fluorine?

The chemical symbol of Fluorine is F.

Where is Fluorine located in the periodic table?

Fluorine is located in period 2 and group 17 and belongs to the “Halogen” category.

What is the atomic mass of Fluorine?

The atomic mass of Fluorine is about 18.998 (atomic mass units).

What is the phase of Fluorine under normal conditions?

The phase of Fluorine under standard conditions is Gas.

What are the uses of Fluorine?

Uses of Fluorine include Toothpaste, Refrigerants and Uranium production.

Who discovered Fluorine?

Fluorine was discovered by Henri Moissan in 1886.

Elements in the same category as Fluorine (Halogen)

Chlorine (Cl)Bromine (Br)Iodine (I)Astatine (At)Tennessine (Ts)

See all Halogens

Fluorine’s group 17 neighbours

Chlorine (Cl)Bromine (Br)Iodine (I)Astatine (At)Tennessine (Ts)

Group 17 of the periodic table